JP4502020B2 - Heating and hot water supply equipment - Google Patents

Description

  The present invention relates to a heating and hot water supply apparatus used for heating and hot water supply.

  Conventionally, as a heating and hot water supply apparatus, there is one disclosed in Japanese Patent Application Laid-Open No. 2004-232914 (Patent Document 1). The heating hot water supply apparatus includes a heat pump, a hot water storage tank for storing hot water heated by the heat pump, a heat exchanger disposed only in an upper region in the hot water storage tank, and a heater connected to the heat exchanger. It has.

  The hot water storage tank is connected to a faucet through a hot water discharge pipe. By opening this faucet, the hot water stored in the hot water storage tank can be taken out from the faucet.

  The heater performs a heating operation using hot water stored in a hot water storage tank. More specifically, when the heating operation is started, the heat medium in the heat exchanger is heated by the hot water in the hot water storage tank. The heated heat medium is sent to the heater and releases heat from the heater into the room.

  However, since the conventional heating and hot water supply apparatus performs the heating operation as an additional function of the water heater using midnight power, the heat to be released indoors during the heating operation from the hot water in the hot water storage tank through the heat exchanger. The efficiency of taking out the heat is getting worse. That is, the heat of the hot water in the hot water storage tank cannot be efficiently supplied to the heater.

Therefore, the above-mentioned conventional heating and hot water supply apparatus cannot perform sufficient heating in a high heating load area such as Northern Europe where the heating operation is performed for 24 hours in winter and the heating load: hot water supply load is 10: 1, for example. There is a problem.
JP 2004-232914 A

  Then, the subject of this invention is providing the heating hot-water supply apparatus which can perform sufficient heating also in areas with high heating load, such as Northern Europe.

In order to solve the above problems, the heating and hot water supply apparatus of the present invention includes:
A heat pump unit;
A hot water storage tank for storing hot water heated by the heat pump unit;
A heat exchanger disposed in the hot water storage tank, in which hot water flows inside,
After passing the hot water stored in the hot water storage tank through the heating terminal outside the hot water storage tank, it is again provided with a circulation circuit for circulating it back into the hot water storage tank,
The heat exchanger is disposed from the lower region to the upper region in the hot water storage tank, and is provided to extend from one side region to the other side region in the hot water storage tank,
The hot water is, the entering at a relatively low temperature state in the portion of the heat exchanger in the lower area of the hot water storage tank, a relatively to the heat exchanger to the hot water and the order of up to the upper region from a lower region within the hot-water storage tank It is configured to go out of the heat exchanger part in the upper region in the hot water tank , becoming hot.
A first water intake port for taking out hot water stored in the hot water storage tank is provided at an upper portion of the hot water storage tank , and hot water discharged from the heating terminal is provided at a lower portion of the hot water storage tank . There is a return port to return to the area ,
The circulation circuit is connected to the first intake port and the return port,
A supply port for supplying hot water stored in a lower region in the hot water storage tank to the heat pump unit is provided below the hot water storage tank.

  According to the heating and hot water supply apparatus having the above configuration, when the heating operation is started, the hot water stored in the hot water storage tank flows to the heating terminal via the circulation path and returns to the hot water storage tank again. Thereby, the heat of the warm water is released into the room through the heating terminal. That is, the heating terminal directly takes out the heat of the hot water in the hot water storage tank and releases it into the room.

  Therefore, since the heat of the hot water in the hot water storage tank can be efficiently supplied to the heating terminal, sufficient heating can be performed even in an area with a high heating load such as Northern Europe.

  Conventionally, heat is taken out via the heat exchanger in the hot water storage tank and supplied to the heating terminal, so that the efficiency is poor and sufficient heating cannot be performed.

  According to the heating and hot water supply apparatus of the present invention, the heat exchanger is disposed from the lower region to the upper region in the hot water storage tank, and hot water enters the lower portion of the hot water storage tank and exits from the upper portion of the hot water storage tank. Therefore, hot water is sufficiently heated by the hot water in the hot water storage tank while flowing through the heat exchanger. Therefore, hot hot water can be discharged from the heat exchanger. In addition, the hot water hot water flowing in from the lower side of the heat exchanger is heat-exchanged in the lower temperature hot water area on the lower side in the hot water storage tank, and flows toward the upper side of the hot water heat exchanger. Heat is exchanged in the hot water area on the upper side, and hot water is discharged as hot water. Thus, since hot water flows while being heated by heat exchange from the bottom to the top according to the temperature gradient in the hot water storage tank, the temperature distribution in the hot water storage tank is not disturbed, and high heat exchange efficiency is obtained. Therefore, the heat exchange efficiency of the heat exchanger for hot water supply can be improved, and hot hot water can be supplied. Further, the temperature gradient is maintained in the vertical direction in the hot water storage tank, and the COP (coefficient of performance) of the heat pump unit can be improved by heating the lower temperature water in the hot water storage tank with the heat pump unit.

  Moreover, according to the heating hot water supply apparatus of the present invention, the first intake port is provided in the upper part of the hot water storage tank, so that the relatively hot water in the upper area in the hot water storage tank is taken out and sent to the heating terminal. be able to. Therefore, heating can be performed with the relatively hot water.

  Moreover, since the said return port is provided in the lower part of the hot water storage tank, the hot water which became comparatively low temperature by the heating terminal can be returned to the lower area | region in a hot water storage tank. Therefore, it is possible to prevent the relatively hot water in the upper region in the hot water storage tank from being mixed with the warm water that has become relatively cold at the heating terminal.

Further, according to the heating and hot water supply apparatus of the present invention, the return port for returning the hot water discharged from the heating terminal to the hot water storage tank is located below the hot water storage tank, and the hot water stored in the hot water storage tank is stored. Coupled with the fact that the supply port for supplying to the heat pump unit is at the bottom of the hot water storage tank, the heat pump unit is always supplied with relatively low temperature hot water, so the COP (coefficient of performance) of the heat pump unit is improved. To do. In particular, when the refrigerant of the heat pump unit is a CO ₂ refrigerant, COP is improved.

In the heating and hot water supply apparatus of one embodiment,
A heater is disposed at a substantially central portion in the vertical direction in the hot water storage tank.

  According to the heating and hot water supply apparatus of the above embodiment, since the heater is disposed in the hot water storage tank, the temperature of the hot water in the hot water storage tank can be maintained or raised by the heater when the heat pump unit fails. .

  Further, when the amount of heat given to the hot water by the heat pump unit is insufficient, there is a heater in the hot water storage tank, so the heater can supply the shortage of heat to the hot water.

  Moreover, since the said heater is arrange | positioned in the approximate center part of the up-down direction in a hot water storage tank, it mainly heats the warm water of the upper area | region in a hot water storage tank above a heater. At this time, since the hot water in the upper region in the hot water storage tank is originally higher in temperature than the hot water in the lower region in the hot water storage tank, it becomes higher in a short time by heating the heater.

  Therefore, even if the heating load increases momentarily, the hot water having a higher temperature in the upper region in the hot water storage tank can be immediately sent to the heating terminal.

In the heating and hot water supply apparatus of one embodiment,
A second water intake for taking out hot water stored in the hot water storage tank is provided at a substantially central portion in the vertical direction of the hot water storage tank so as to be positioned near and above the heater,
The circulation circuit is connected to the second water intake.

  According to the heating and hot water supply apparatus of the above embodiment, when the heating load momentarily increases during the heating operation, the hot water in the hot water storage tank is heated to a high temperature by the heater, and this hot water is taken out from the second intake port of the circulation circuit. Send to heating terminal. At this time, the second water intake port is provided at a substantially central portion in the vertical direction of the hot water storage tank and is positioned near and above the heater, so that the hot water immediately after being heated by the heater is taken out and sent to the heating terminal. Can do.

  Therefore, even if the heating load increases momentarily, it is possible to quickly and reliably cope with the instantaneous increase in heating load.

In the heating and hot water supply apparatus of one embodiment,
The refrigerant used in the heat pump unit is a CO ₂ refrigerant.

According to the heating and hot water supply apparatus of the above-described embodiment, the heat pump unit uses CO ₂ refrigerant as the refrigerant, so that hot water can be discharged.

  According to the heating hot water supply apparatus of the present invention, by sending the hot water stored in the hot water storage tank to the heating terminal via the circulation path, the heat of the hot water can be efficiently supplied to the heating terminal without passing through the heat exchanger. For example, sufficient heating can be performed in an area with a high heating load such as a 24-hour heating operation in winter such as Northern Europe.

  Hereinafter, the heating hot-water supply apparatus of this invention is demonstrated in detail by embodiment of illustration.

  FIG. 1 is a schematic diagram showing a configuration of a heating and hot water supply apparatus according to an embodiment of the present invention.

  The heating and hot water supply apparatus includes a heat pump unit 1, a hot water storage tank 2, a hot water supply heat exchanger 3, and a heating circulation circuit 4. The hot water supply heat exchanger 3 is an example of a heat exchanger, and the heating circulation circuit 4 is an example of a circulation circuit.

  The heat pump unit 1 includes a refrigerant circuit 16 and an electric blower 17 and boiles water in the hot water storage tank 2 to make warm water.

The refrigerant circuit 16 includes an evaporator 11, a compressor 12, a condenser (water refrigerant heat exchanger) 13, a supercooling heat exchanger 14, and an expansion valve 15. In the refrigerant circuit 16, CO ₂ refrigerant circulates.

In the evaporator 11, the CO ₂ refrigerant absorbs heat in the air sent from the electric blower 17 and gasifies it. The CO ₂ refrigerant is compressed by the compressor 12 and becomes high temperature, and then reaches the condenser 13 to release heat. As a result, the CO ₂ refrigerant becomes lower in temperature than before entering the condenser 13 and flows toward the supercooling heat exchanger 14. The CO ₂ refrigerant is further cooled by the supercooling heat exchanger 14 and then returns to the evaporator 11 via the expansion valve 15.

  The heat pump unit 1 is connected to a hot water storage tank 2 via a boiling circulation circuit 5.

  The boiling circulation circuit 5 is provided with a boiling circulation pump 51 and a boiling three-way valve 52. The boiling circulation circuit 5 is connected to the second heating forward connection port 42, the heating supply port 53, and the antifreezing water return connection port 54. In addition, the said 2nd heating outgoing connection port 42 is an example of a 1st water intake port.

  The supply port 53 is provided in the lower part of the hot water storage tank 2. Thereby, the relatively low temperature hot water in the lower region in the hot water storage tank 2 can be supplied to the boiling circulation pump 51 through the supply port 53.

  The boiling circulation pump 51 sucks the relatively low temperature hot water in the lower region in the hot water storage tank 2 and discharges the sucked relatively low temperature hot water toward the condenser 13.

In the condenser 13, the CO ₂ refrigerant and hot water are heat-exchanged, and the hot water becomes high temperature. The hot hot water exiting the condenser 13 goes to the boiling three-way valve 52.

  The boiling three-way valve 52 allows hot hot water from the condenser 13 to flow to the upper region in the hot water storage tank 2 via the second heating forward connection port 42 during hot water supply operation and heating operation. Therefore, the second heating / outgoing connection port 42 is a heating return connection port through which hot water flows out from the supply port 53 of the hot water storage tank 2 and exits the condenser 13 of the heat pump unit 1. The hot water in the hot water storage tank 2 is formed with a hot water layer (temperature distribution) so that the hot water at the upper side is located at the upper side and the hot water at the lower side is located at the lower side. When the heat pump unit 1 is activated, for example, when the hot water coming out of the condenser 13 of the heat pump unit 1 has not yet reached a sufficiently high temperature, the hot water is not the second heating forward connection port 42 but the antifreeze water. The three-way valve 52 is controlled so as to be returned to the hot water storage tank 2 via the return connection port 54. Therefore, the freeze prevention water return connection port 54 is a second boiling return connection port when the hot water is not sufficiently hot. Thus, switching the return port according to the temperature of the hot water may prevent the temperature distribution in the hot water tank 2 from being disturbed if hot water that is not sufficiently hot is returned to the upper part of the hot water tank 2. Because. This switching of the three-way valve is performed based on the output of a temperature sensor (not shown) provided between the condenser 13 and the three-way valve 52. Further, during the freeze prevention operation, the boiling three-way valve 52 supplies hot water flowing from the supply port 53 via the boiling circulation circuit 5 via the freeze prevention water return connection port 54 to the hot water storage tank 2. Flow in the lower area inside. The freeze prevention operation is performed while the boiling operation is stopped.

  The hot water storage tank 2 stores hot water heated by the heat pump unit 1. In addition, a heater 6 is disposed at a substantially central portion in the vertical direction in the hot water storage tank 2, and the heater 6 directly heats the hot water in the hot water storage tank 2. Although not shown, a plurality of temperature sensors are provided in the hot water storage tank 2 in order to detect the temperature of hot water in each part in the hot water storage tank 2. The plurality of temperature sensors detect the temperature of hot water in each part in the hot water storage tank 2 and send a signal indicating the temperature to the control unit 7.

  A signal indicating the temperature of the hot water in the lower region in the hot water storage tank 2 is used for ON / OFF control of the compressor 12 and the boiling circulation pump 51. That is, the control unit 7 controls ON / OFF of the compressor 12 and the boiling circulation pump 51 based on the temperature of the hot water in the lower region in the hot water storage tank 2.

  As shown in FIG. 2, the heat exchanger 3 for hot water supply is formed of a coiled pipe and is arranged from the lower region to the upper region in the hot water storage tank 2. The hot water is heated by flowing through the hot water heat exchanger 3. More specifically, the hot water enters the hot water storage tank 2 from the lower part of the hot water storage tank 2 and flows upward through the hot water supply heat exchanger 3 arranged in the lower region of the hot water storage tank 2. The hot water flows through the hot water heat exchanger 3 disposed in the upper region of the hot water tank 2 upward, and then flows out of the hot water tank 2 from the upper part of the hot water tank 2. In addition, a heater 6 is disposed at the center of the hot water storage tank 2 in the vertical direction, and the heat exchanger 3 for hot water supply is disposed so as to straddle the heater 6 (upper coil portion 3a, lower coil portion 3b). ). With this heater 6, hot hot water can be stored in the upper part of the hot water storage tank 2.

  Further, in order to adjust the temperature of the hot water supply to the set temperature, the hot water mixing valve 31 is opened, and the hot water supplied from the hot water storage tank 2 and the hot water before flowing into the hot water storage tank 2 are mixed. Thereby, the temperature of the hot water supplied from the hot water storage tank 2 can be lowered.

  The heating circulation circuit 4 is for circulating the hot water stored in the hot water storage tank 2 again through the plurality of radiators 8 outside the hot water storage tank 2 and then returning it to the hot water storage tank 2. The heating circulation circuit 4 is connected to the first and second heating forward connection ports 41 and 42 and the heating return connection port 43. In addition, the said 1st heating outgoing connection port 41 is an example of a 2nd water intake, and the heating return connection port 43 is an example of a return port.

  The first heating outgoing connection port 41 is for taking out hot water in the hot water storage tank 2. The first heating / outgoing connection port 41 is provided at a substantially central portion in the vertical direction of the hot water storage tank 2, and is positioned near and above the heater 6. Thereby, the hot water immediately after being heated by the heater 6 can be taken out from the first heating forward connection port 41 and sent to the plurality of radiators 8. In addition, as shown in FIG. 2, the warm water taken out from the 1st heating outgoing connection port 41 is comprised so that it may flow out from the upper surface of the hot water storage tank 2 via the piping 41a.

  Similarly to the first heating forward connection port 41, the second heating forward connection port 42 is also for taking out hot water in the hot water storage tank 2. The second heating / outgoing connection port 42 is provided in the upper part of the hot water storage tank 2. Thereby, the hot water of the upper area | region in the said hot water storage tank 2 can be taken out from the 2nd heating outgoing connection port 42, and can be sent to the several radiator 8. FIG. The second heating / outgoing connection port 42 is also used as a heating return connection port.

  Each radiator 8 directly takes out the heat of the hot water flowing from the hot water storage tank 2 and discharges it into the room. And the said warm water becomes low temperature, leaves each radiator 8, and flows toward the heating return connection port 43. FIG.

  The heating return connection port 43 is provided in the lower part of the hot water storage tank 2. Thereby, the hot water which came out of the said heating return connection port 43 can be mixed with the hot water of the lower area | region in the hot water storage tank 2. FIG.

  The heating circulation circuit 4 is provided with a bypass pipe 44, a heating mixing valve 45, first and second temperature sensors 46 and 47, a heating circulation pump 48, and a heating three-way valve 49.

  The bypass pipe 44 guides a part of the hot water flowing from the radiator 8 to the heating return connection port 43 to the heating mixing valve 45.

  The heating mixing valve 45 has an inlet through which hot water from the hot water storage tank 2 flows and an inlet through which hot water from the bypass pipe 44 flows. Although described in detail later, the opening degree of each inlet of the heating mixing valve 45 is adjusted by the control unit 7.

  The first temperature sensor 46 detects the temperature of hot water from the hot water storage tank 2 toward the radiator 8 and sends a signal indicating this temperature to the control unit 7.

  The second temperature sensor 47 detects the temperature of hot water from the radiator 8 toward the hot water storage tank 2, and sends a signal indicating this temperature to the control unit 7.

  The control unit 7 receives a signal indicating the outside air temperature from the outside air temperature sensor 18 and also receives a signal indicating the room temperature from an indoor temperature sensor (not shown). The control unit 7 adjusts the opening degree of each of the two inlets of the heating mixing valve 45 based on signals from the outside air temperature sensor 18 and the first and second temperature sensors 46 and 47, or for heating. The rotational speed of the circulation pump 48 is adjusted. For example, when the outside air temperature is high, the heating mixing valve 45 is adjusted to increase the inflow amount of hot water from the bypass pipe 44, thereby reducing the going-out temperature or reducing the number of rotations of the heating circulation pump 48 for circulation. Lower the return temperature by lowering the flow rate of warm water. On the other hand, when the outside air temperature is low, the heating mixing valve 45 is adjusted to reduce the inflow amount of hot water from the bypass pipe 44, thereby increasing the going-out temperature or increasing the number of rotations of the heating circulation pump 48 for circulation. Increase the return temperature by increasing the flow rate of hot water.

  The heating circulation pump 48 sucks the hot water in the hot water storage tank 2 through the second heating outgoing connection port 42 or the first heating outgoing connection port 41 and discharges it toward the radiators 8.

  The heating three-way valve 49 extracts hot water from the first heating forward connection port 41 when a high temperature region of the hot water in the hot water storage tank 2 exists in the vicinity of the first heating forward connection port 41. Further, the heating three-way valve 49 extracts hot water from the second heating forward connection port 42 when the high temperature region of the hot water in the hot water storage tank 2 does not exist in the vicinity of the first heating forward connection port 41. The control unit 7 switches the heating three-way valve 49. That is, the control unit 7 switches the heating three-way valve 49 based on signals from a plurality of temperature sensors for detecting the temperature of hot water in each part in the hot water storage tank 2.

  When the heating hot water supply apparatus having the above configuration starts the heating operation, the heating circulation pump 48 is operated. Thereby, the hot water stored in the hot water storage tank 2 is sent to the plurality of radiators 8 and returned to the hot water storage tank 2 again. At this time, the heat of the warm water is released into the room through the radiator 8. That is, each radiator 8 directly takes out the heat of the hot water in the hot water storage tank 2 and discharges it into the room.

  Therefore, since the heat of the hot water in the hot water storage tank 2 can be efficiently supplied to the radiator 8, sufficient heating can be performed even in an area with a high heating load such as Northern Europe.

  The hot water supply heat exchanger 3 is arranged from the lower region to the upper region in the hot water storage tank 2 and hot water enters the lower portion of the hot water storage tank 2 and exits from the upper portion of the hot water storage tank 2. Is sufficiently heated by the hot water in the hot water storage tank 2 while flowing in the hot water heat exchanger 3. Therefore, hot water can be discharged from the hot water supply heat exchanger 3.

  Further, since the hot water having a relatively low temperature by the radiator 8 returns to the hot water storage tank 2 from the heating return connection port 43, the relatively low temperature hot water can be returned to the lower region in the hot water storage tank 2. Therefore, it is possible to prevent the hot water having a relatively high temperature in the upper region in the hot water storage tank 2 from being mixed with the hot water having a relatively low temperature by the radiator 8 to become a low temperature.

  Moreover, since the supply port 53 is provided in the lower part of the said hot water storage tank 2, the comparatively low temperature warm water in the lower area | region in the hot water storage tank 2 is supplied to the condenser 13 of the heat pump unit 1. FIG. Therefore, the COP of the heat pump unit 1 is improved.

  When the heat pump unit 1 fails, the temperature of the hot water in the hot water storage tank 2 can be maintained or raised by directly heating the hot water in the hot water storage tank 2 with the heater 6.

  Further, even when the amount of heat given to the hot water by the heat pump unit 1 is insufficient, the amount of heat that is insufficient can be supplemented by the heater 6.

Moreover, since the heater 6 is disposed at a substantially central portion in the vertical direction in the hot water storage tank 2,
Mainly, the hot water above the heater 6 is heated. At this time, since the hot water in the upper region in the hot water storage tank 2 is originally higher in temperature than the hot water in the lower region in the hot water storage tank 2, it becomes higher in a short time due to the heating of the heater 6.

  Therefore, even if the heating load increases momentarily, the hot water having a higher temperature in the upper region in the hot water storage tank 2 can be immediately sent to the radiator 8.

  Further, when the heating load is momentarily increased during the heating operation, the hot water in the hot water storage tank 2 is heated to a high temperature by the heater 6, and this high temperature hot water is taken out from the first heating forward connection port 41 of the heating circulation circuit 4. Send to 8. At this time, the first heating / outgoing connection port 41 is provided at a substantially central portion in the vertical direction of the hot water storage tank 2 and is located near and above the heater 6, so that the hot water immediately after being heated by the heater 6 is taken out. Can be sent to the radiator 8.

  Therefore, even if the heating load increases momentarily, it is possible to quickly and reliably cope with the instantaneous increase in heating load.

Further, the heat pump unit 1, because it uses CO ₂ refrigerant as refrigerant, can be high temperature hot water.

  The temperature of the hot water supplied to the heat pump unit 1 is preferably low from the viewpoint of improving COP.

In the above embodiment, the heat pump unit 1 uses the CO ₂ refrigerant, but may use an NH ₃ refrigerant, an R22 refrigerant, or the like. Moreover, although the radiator was used as a heating terminal, you may use a floor heating panel, a fan coil, etc. instead of this or together with this.

  In the said embodiment, although the heat pump unit 1 which has the supercooling heat exchanger 14 was used, you may use the heat pump unit which does not have the supercooling heat exchanger 14. FIG.

FIG. 1 is a schematic diagram of a heating and hot water supply apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing details of the hot water storage tank and its vicinity.

DESCRIPTION OF SYMBOLS 1 Heat pump unit 2 Hot water storage tank 3 Heat exchanger for hot water supply 4 Circulation circuit for heating 8 Radiator 41 1st water intake port 42 2nd water intake port 43 Return port 53 Supply port

Claims (4)

Heat pump unit (1),
A hot water storage tank (2) for storing hot water heated by the heat pump unit (1);
A heat exchanger (3) which is disposed in the hot water storage tank (2) and in which hot water flows inside;
A circulation circuit for circulating the hot water stored in the hot water storage tank (2) through the heating terminal (8) outside the hot water storage tank (2) and then returning it to the hot water storage tank (2) for circulation. (4)
The heat exchanger (3) is arranged from the lower region in the hot water storage tank (2) to the upper region, and from one side region in the hot water storage tank (2) to the other side region. It is provided to cross,
The hot water is contained at a relatively low temperature state to a portion of the heat exchanger (3) in the lower region within the hot-water storage tank (2), from the lower region of the hot-water storage tank (2) in to the upper region Heat exchange with hot water in order leads to a relatively high temperature state and exits from the heat exchanger (3) in the upper area of the hot water storage tank (2).
A first water intake (42) for taking out hot water stored in the hot water storage tank (2) is provided at the upper part of the hot water storage tank (2), while the heating air is provided at the lower part of the hot water storage tank (2). A return port (43) is provided for returning the hot water from the terminal (8) to the lower region in the hot water storage tank (2),
The circulation circuit (4) is connected to the first intake port (42) and the return port (43),
A supply port (53) for supplying hot water stored in a lower region of the hot water storage tank (2) to the heat pump unit (1) is provided at the lower part of the hot water storage tank (2). Heating water heater. In the heating hot water supply apparatus according to claim 1,
A heating and hot water supply apparatus, wherein a heater (6) is disposed at a substantially central portion in the vertical direction in the hot water storage tank (2). In the heating hot water supply apparatus according to claim 2,
A second water intake (41) for taking out the hot water stored in the hot water storage tank (2) is located near and above the heater (6) at a substantially central portion in the vertical direction of the hot water storage tank (2). Provided to
The heating and hot water supply apparatus, wherein the circulation circuit (4) is connected to the second water intake (41). In the heating hot-water supply apparatus as described in any one of Claim 1 to 3,
A heating / hot water supply apparatus, wherein the refrigerant used in the heat pump unit (1) is a CO ₂ refrigerant.

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